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276 lines (236 loc) · 8.41 KB
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import io
import os
from ..EndianBinaryReader import EndianBinaryReader
from ..EndianBinaryWriter import EndianBinaryWriter
from ..helpers import CompressionHelper
class BundleFile:
bundle_reader: EndianBinaryReader
files: list
path: str
signature: str
format: int
version_player: str
version_engine: str
def __init__(self, bundle_reader: EndianBinaryReader, path: str):
self.files = []
self.path = path
self.signature = bundle_reader.read_string_to_null()
self.format = bundle_reader.read_int()
self.version_player = bundle_reader.read_string_to_null()
self.version_engine = bundle_reader.read_string_to_null()
if self.signature in ["UnityWeb", "UnityRaw", "\xFA\xFA\xFA\xFA\xFA\xFA\xFA\xFA"]:
if self.format < 6:
bundleSize = bundle_reader.read_int()
elif self.format == 6:
self.read_format_6(bundle_reader, True)
return
dummy2 = bundle_reader.read_short()
offset = bundle_reader.read_short()
if self.signature in ["UnityWeb", "\xFA\xFA\xFA\xFA\xFA\xFA\xFA\xFA"]:
dummy3 = bundle_reader.read_int()
lzma_chunks = bundle_reader.read_int()
bundle_reader.Position = bundle_reader.Position + (lzma_chunks - 1) * 8
lzma_size = bundle_reader.read_int()
stream_size = bundle_reader.read_int()
bundle_reader.Position = offset
lzma_buffer = bundle_reader.read_bytes(lzma_size)
data_reader = EndianBinaryReader(CompressionHelper.decompress_lzma(lzma_buffer))
self.get_assets_files(data_reader, 0)
elif self.signature == "UnityRaw":
bundle_reader.Position = offset
self.get_assets_files(bundle_reader, offset)
elif self.signature == "UnityFS":
if self.format == 6:
self.read_format_6(bundle_reader)
def get_assets_files(self, reader: EndianBinaryReader, offset):
file_count = reader.read_int()
self.files = [
File(self.format, reader, offset)
for _ in range(file_count)
]
def read_format_6(self, bundle_reader: EndianBinaryReader, padding=False):
bundle_size = bundle_reader.read_long()
compressed_size = bundle_reader.read_int()
uncompressed_size = bundle_reader.read_int()
flag = bundle_reader.read_int()
self._header_compression_flag = flag
if padding:
bundle_reader.read_byte()
if (flag & 0x80) != 0: # at end of file
position = bundle_reader.Position
bundle_reader.Position = bundle_reader.Length - compressed_size
block_info_bytes = bundle_reader.read_bytes(compressed_size)
bundle_reader.Position = position
else:
block_info_bytes = bundle_reader.read_bytes(compressed_size)
switch = flag & 0x3F
if switch == 1: # LZMA
blocks_info_data = CompressionHelper.decompress_lzma(block_info_bytes)
elif switch in [2, 3]: # LZ4, LZ4HC
blocks_info_data = CompressionHelper.decompress_lz4(block_info_bytes, uncompressed_size)
# elif switch == 4: #LZHAM:
else: # no compression
blocks_info_data = block_info_bytes
blocks_info_reader = EndianBinaryReader(blocks_info_data)
blocks_info_reader.Position = 0x10
block_count = blocks_info_reader.read_int()
block_infos = [
BlockInfo(blocks_info_reader)
for _ in range(block_count)
]
data = []
for block_info in block_infos:
switch = block_info.flag & 0x3F
if switch == 1: # LZMA
data.append(CompressionHelper.decompress_lzma(bundle_reader.read(block_info.compressed_size)))
elif switch in [2, 3]: # LZ4, LZ4HC
data.append(CompressionHelper.decompress_lz4(bundle_reader.read(block_info.compressed_size),
block_info.uncompressed_size))
# elif switch == 4: #LZHAM:
else: # no compression
data.append(bundle_reader.read(block_info.compressed_size))
data_stream = EndianBinaryReader(b''.join(data))
entry_info_count = blocks_info_reader.read_int()
self.files = [
File(6, blocks_info_reader, data_stream)
for _ in range(entry_info_count)
]
def save(self):
writer = EndianBinaryWriter()
writer.write_string_to_null(self.signature)
writer.write_int(self.format)
writer.write_string_to_null(self.version_player)
writer.write_string_to_null(self.version_engine)
if self.format == 6: # WORKS
padding = True if self.signature in ["UnityWeb", "UnityRaw", "\xFA\xFA\xFA\xFA\xFA\xFA\xFA\xFA"] else False
self.save_format_6(writer, padding)
else: # WIP
raise NotImplementedError("Not Implemented")
return writer.bytes
def save_format_6(self, writer: EndianBinaryWriter, padding=False):
header_compression_flag = self._header_compression_flag
# WORKS
data_compression = self._header_compression_flag & 0x3F
block_info_compression = self._header_compression_flag & 0x3F
# generate compressed data
# Structure:
# main stream:
# bundle_size - ???
# compressed_size - size after compression
# uncompressed_size - size before compression
# flag - compression - none = 0x10
# block_info - read via compressed_size
# block_info stream:
# 0x10 offset
# block_count - number of blocks
# block_infos - block infos - read after another
# uncompressed_size
# compressed_size
# flag - compression - none = 0
# data - read blocks from info and merge them
# entry_info_count - number of files
# files:
# offset - in data stream
# size - in data stream
# flag - compression
# name
# data stream: - data from block info stream
# files read via entry infos from block info
files = self.files # packed assets, self.files for debugging
# data - compression can be added later on
data = b"".join(f.stream.getbuffer() for f in files)
# block info stream
bs = EndianBinaryWriter()
# weird offset
bs.write(b"\x00" * 0x10)
# block count = 1 - enough for up to 4 GB
bs.write_int(1)
# uncompressed_size
bs.write_u_int(len(data))
# compress data
if data_compression == 1: # LZMA
data = CompressionHelper.compress_lzma(data)
elif data_compression in [2, 3]: # LZ4, LZ4HC
data = CompressionHelper.compress_lz4(data)
elif data_compression == 4: # LZHAM
raise NotImplementedError("not implemented")
# data = compress(data)
bs.write_u_int(len(data))
# compression flag
bs.write_short(header_compression_flag)
# entry info count
bs.write_int(len(files))
offset = 0
for f in files:
offset = f.write(6, bs, offset)
block_info_data = bs.bytes
# calculate sizes
uncompressed_size = len(block_info_data)
# compress block
if block_info_compression == 1: # LZMA
block_info_data = CompressionHelper.compress_lzma(block_info_data)
elif block_info_compression in [2, 3]: # LZ4, LZ4HC
block_info_data = CompressionHelper.compress_lz4(block_info_data)
elif block_info_compression == 4: # LZHAM:
raise NotImplementedError("not implemented")
compressed_size = len(block_info_data)
bundle_size = writer.Position + len(data) + len(block_info_data) + 8 + 4 + 4 + 4 + (1 if padding else 0)
flag = 64 + block_info_compression
# write stuff
writer.write_long(bundle_size)
writer.write_int(compressed_size)
writer.write_int(uncompressed_size)
writer.write_int(flag)
if padding:
writer.write_byte(1)
writer.write(block_info_data)
writer.write(data)
class File:
flag: int
path: str
stream: io.BytesIO
@property
def name(self):
return os.path.basename(self.path)
def __init__(self, format: int, *args):
if format == 6:
blocks_info_reader = args[0]
data_stream = args[1]
offset = blocks_info_reader.read_long()
size = blocks_info_reader.read_long()
self.flag = blocks_info_reader.read_int()
self.path = blocks_info_reader.read_string_to_null()
data_stream.Position = offset
self.stream = io.BytesIO(data_stream.read(size))
else:
reader = args[0]
offset = args[1]
self.path = reader.read_string_to_null()
offset = reader.read_int() + offset
size = reader.read_int()
next_file_pos = reader.Position
reader.Position = offset
self.stream = io.BytesIO(reader.read(size))
reader.Position = next_file_pos
def write(self, format: int, bs: EndianBinaryWriter, offset):
if format == 6:
# offset
bs.write_long(offset)
length = len(self.stream.getbuffer())
# size
bs.write_long(length)
# flag
bs.write_int(self.flag)
# file_name
bs.write_string_to_null(self.name)
return offset + length
else:
raise NotImplementedError(f"writing files, format {format}")
class BlockInfo:
compressed_size: int
uncompressed_size: int
flag: int
def __init__(self, reader: EndianBinaryReader):
self.uncompressed_size = reader.read_u_int()
self.compressed_size = reader.read_u_int()
self.flag = reader.read_short()